老师,帮忙一个句子,thxAsexternalconditionschange,itbecomestoughertomeetthethreeconditionsthatsociologistssincethe1950shaveconsideredcrucialtomakingclosefriends.请问这里to后面为什么是make的ing形式呢?

Question

老师,帮忙一个句子,thx
As external conditions change,it becomes tougher to meet the three conditions that sociologists since the 1950s have considered crucial to making close friends.请问这里to后面为什么是make的ing形式呢?

Answer 1

你好!
你的问题涉及两个结构的结合：
①consider the three conditions crucial
这是【及物动词的复合结构】：即——
及物动词+宾语+宾语补足语（名词/代词；形容词；副词；介词短语；非谓语动词）
这里是【及物动词+宾语+形容词作宾语补足语】
②形容词短语及搭配介词：
be crucial【 to介词】 (doing)sth … 对…至关重要
这两个结构合二为一就是原句所出现的【及物动词的复合结构】.
但是,只有看清楚句子结构和句子成分,才能更清楚的理解这个结构：
【As external conditions change原因状语从句】,【it 形式主语】【becomes 谓语】【tougher 表语】【to meet the three conditions that sociologists since the 1950s have considered crucial to making close friends不定式短语,真主语】
to meet【 the three conditions先行词】 【that sociologists since the 1950s have considered crucial to making close friends定语从句】
【the three conditions 先行词,作从句谓语动词的宾语】 that 【sociologists从句主语】 since the 1950s【 have considered 谓语】【crucial to making close friends宾语补足语】
祝你开心如意!